<p> <br/> Route path: /train/from-:to <br/> Request URL: http://localhost:3000/train/AHM-BRD <br/> 请求参数应该是什么？( )</p>
<p> {"from": "AHM", "to": "BRD"}</p>
<p> {"train": "AHM", "to": "BRD"}</p>
<p> {"from": "AHM", "train": "BRD"}</p>
<p> 都不是</p>
